CG Bookmarklet is a way for starting CG-Button on websites where Content Glass is not installed. Unlike Chrome plugin it is not limited to Chrome browser. However unlike Chrome plugin it does not start Cg-Button automatically and you need to click the bookmark for Content Glass to load on web page.
The bookmarklet is actually a bookmark that instead of just redirecting to website is running a script. This script loads Content Glass on the current website. This approach is common.
The first step is dragging the bookmarklet onto bookmarks toolbar. Once bookmark was set you can use it on multiple websites.
To start Content Glass click the bookmarklet. This will load Content Glass on the current page (assuming that website permit 3'rd party scripts to run on it):